JPH0565424U - Puncher punch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a punch punch for reducing the power load on the puncher, ensuring the sharpness of the cutting edge, and being less susceptible to the so-called prying force at the time of punching holes. Further, the punch punch for avoiding the shortening of the distance between the punch and the die due to the protrusion of the guide pin is provided. [Structure] The punch (10) is formed on the outer circumference of the front end face,
It has a cutting edge (14) that is at a right angle or an acute angle with respect to the outer peripheral surface, a first front end surface (15) that extends radially inward from the cutting edge, and a protrusion that protrudes forward from the first front end surface. The protruding portion defines an inner edge of the first front end surface, and defines a side wall (18) extending forward at a predetermined angle with respect to the first front end surface, and defining a front edge of the side wall with respect to the side wall. A second front end face (16) forming a right angle or an obtuse angle. A groove (17) extending from the axis of the punch to the edge of the second front end face is formed in the second front end face.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch punch, and more particularly, to a punch structure attached to a front end portion of a piston rod of a puncher.

[0002]

[Prior Art]

 There is known a portable puncher that includes a fixed die and a punching punch, and punches a workpiece such as a steel plate with a cutting edge of the punch (Japanese Patent Laid-Open No. 58-224029). Such a puncher is equipped with a hydraulic actuating mechanism including a hydraulic cylinder as an actuating device for the punch, and the punch is attached to the front end portion of the piston rod of the hydraulic cylinder. The front end surface of the punch is generally flat, and a guide pin is provided on the shaft core so as to project therefrom. The guide pin is used for aligning the plate and the punch, and is visually aligned with the marking line of the plate immediately before the punching work.

The applicant of the present invention has proposed a punch of such a puncher, which has a guide pin movably arranged on the axial center of the punch (Japanese Patent Laid-Open No. 3-18902). .. This guide pin greatly protrudes from the front end surface of the punch due to the elastic force of the compression spring, facilitates the alignment of the plate and the punch, and is pushed by the plate during punching and retracted into the punch. Allows for dawn processing. In addition, the guide pin can be separated from the punch to facilitate the work of polishing the cutting edge formed on the outer periphery of the punch.

[0004]

[Problems to be solved by the device]

 Regarding such a punch, the shape of the cutting edge and the shape of the front end portion of the punch have been improved from the viewpoints of reducing the power load on the puncher and ensuring the sharpness of the cutting edge. 6 to 8 are sectional views showing examples of the shape of the front end portion of the punch. FIG. 6 shows the most common cross-sectional shape of the front end of the punch, and FIG. 7 shows the cross-sectional shape of the front end of the punch designed with emphasis on the sharpness of the cutting edge. Further, FIG. 8 shows the shape of the front end portion of the punch designed to reduce the power load of the puncher.

However, when the front end face has a generally flat cross-sectional shape as shown in FIG. 6, the punch front end face is wholly pressed by the plate material during punching, resulting in a large punching resistance and a puncher power consumption. The load will increase. In addition, when the punch is designed in a cross-sectional shape with the center part of the front end face depressed as shown in Fig. 7, the sharpness of the cutting edge can be secured, but the guide pin cannot be provided and the punch and plate are aligned. There is a problem that it is difficult to do.

In order to solve such a problem, it is possible to adopt a cross-sectional shape in which the central portion of the front end face is projected as shown in FIG. With this punch, the power load during punching can be slightly reduced. However, not only the sharpness of the cutting edge located on the outer circumference of the punch is lost, but also when the so-called two holes are overlapped, the slanted wall of the protruding part abuts against the edge of the existing hole, and A diagonal load is applied. For this reason, there arises a problem that a so-called twisting force acts on the punch.

Further, in such a punch, although the guide pin is provided on the front end face of the punch, the distance between the tip of the guide pin and the die is considerably shortened due to the protrusion of the central portion of the front end face. The thickness of the plate that can be inserted between the die and the die is greatly limited. The present invention has been made in view of the above point, and reduces the power load of the puncher, secures the sharpness of the cutting edge, and has a shape in which a so-called prying force is hard to act when the holes are drilled. The first purpose is to provide a punch punch.

A second object of the present invention is to provide a punch punch for avoiding the shortening of the distance between the punch and the die due to the protrusion of the guide pin.

[0009]

Means and Actions for Solving the Problems In order to achieve the above-mentioned first object, the present invention provides a cutting blade formed on the outer circumference of the front end surface of a punch and forming a right angle or an acute angle with the outer circumference surface of the punch. A first front end surface extending inward from the cutting edge in the radial direction of the punch, and a projection protruding forward from the first front end surface, the projection defining an inner edge of the first front end surface. And a second front end face that defines a front edge of the side wall and forms a right angle or an obtuse angle with respect to the side wall. We provide punch punches that are characterized by that.

The puncher punch having the above structure has a cutting edge that makes a right angle or an acute angle with respect to the outer peripheral surface of the punch, and secures the sharpness of the cutting edge. Further, since the front end of the punch is gradually pressed against the plate material, the power load is dispersed and the maximum power load is reduced. For example, according to the test by the applicant, the load current value is reduced by about 20% as compared with the conventional one. Furthermore, since the side wall hits the edge of the existing hole at a fairly acute angle during the over-drilling process, or the cutting edge of the circumference of the front end surface hits this edge, the so-called prying force is hard to act on the punch.

In order to achieve the second object, the present invention also provides a cutting edge formed on the outer circumference of the front end surface of the punch and forming a predetermined angle with the outer circumferential surface of the punch, and the punch from the cutting edge. A first front end face extending inward in the semi-radial direction, and a second front end face arranged in front of the first front end face. The second front end face is provided on the second front end face from the axial center of the punch. There is provided a punch punch for punching, which is characterized in that a groove extending to the edge of the punch is formed.

In the puncher punch having this structure, the second front end face forming the frontmost end face of the punch is provided with a groove indicating the axis, and the groove is made visible from the edge of the second front end face. Therefore, when aligning the punch and the plate member, the groove and the marking line of the plate member may be aligned with each other. Thus, according to the punch having the above structure, the punch and the plate member can be aligned with each other without providing the conventional guide pin protruding from the front end face of the punch.

[0013]

【Example】

 Hereinafter, preferred embodiments of a punch punch according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a hydraulically-operated puncher having a punch according to an embodiment of the present invention.

As shown in FIG. 1, the puncher 1 includes a portable handle 2, an electric motor 3 supported by the portable handle 2, a pump portion 4 connected to the electric motor 3, a pump portion 4, and a hydraulic pressure. The hydraulic cylinder portion 5 that constitutes an actuating mechanism and a jaw-shaped head or jaw 6 that extends forward from the hydraulic cylinder portion 5 are substantially configured. The portable handle 2 includes a trigger switch 21 for manually controlling the operation of the electric motor 3 and a grip portion 22 held by a worker with his / her fingers.

The electric motor 3 includes an output shaft 30 extending into the pump portion 4, and the output shaft 30 has a cam shaft 31 at a front end portion thereof. The central axis of the cam shaft 31 is slightly eccentric with respect to the rotation axis of the output shaft 30. A needle bearing 32 is arranged on the outer periphery of the cam shaft 31 concentrically with the cam shaft 31. A housing 40 of the pump portion 4 is connected to the electric motor 3, and an oil tank 42 for containing hydraulic oil is formed in the pump housing 40. A supply port 48 penetrating the housing 40 is formed above the oil tank 42, and a plug 49 is screwed into the supply port 48. The pump piston 41 that constitutes each pump unit 4 a of the pump unit 4 is in sliding contact with the outer peripheral surface of the needle bearing 32. The pump piston 41 is constantly urged by a spring 44 upward in the drawing, that is, toward the needle bearing 32. An oil passage 43 communicating with the oil tank 42 is arranged adjacent to the lower end of the pump piston 41, and an opening / closing valve 45 is arranged in an oil passage 47 between the pump unit 4 and the hydraulic cylinder device 5. It The on-off valve 45 is biased toward the pump piston 41 by the spring 46, and normally closes the oil passage 47.

The hydraulic cylinder device 5 includes a cylinder case 50, a piston 51 reciprocally arranged in the cylinder case, and hydraulic chambers 52 and 53 defined on both sides of the piston 51, respectively. There is. The hydraulic chamber 52 can communicate with the oil passage 47, and can communicate with the release oil passage 54 when the release valve device 55 is opened. The release valve device 55 is opened when the piston 51 moves forward by a predetermined distance, and connects the hydraulic chamber 52 and the release oil passage 54. As a result, the hydraulic oil in the hydraulic chamber 52 is returned to the oil tank 42 via the release oil passage 54.

Further, an oil storage device is provided in the auxiliary handle 2a for absorbing or supplementing excess hydraulic oil or insufficient hydraulic oil caused by a difference in volume change rate between the hydraulic chamber 52 and the hydraulic chamber 53. The oil storage device includes an oil storage chamber 55a that communicates with the hydraulic chamber 53 via an oil passage 56, and an air chamber 55b that is separated from the oil storage chamber 55a by a flexible film 55c. The air chamber 55b is open to the atmosphere.

In the hydraulic chamber 53, a return spring 57 that urges the piston 51 backward and a piston rod 58 that extends forward from the piston 51 are arranged. The return spring 57 always holds the piston 51 at the most retracted position. Further, the piston rod 58 penetrates the hydraulic chamber 53 and the cylinder connecting portion 60 of the jaw 6 which defines the front end of the hydraulic chamber 53, and the punch 10 is fixed by the fixing bolt 19 to the piston rod 58. It is fixed to the front end of 58.

The jaw 6 extends downward from the cylinder connecting portion 60 and extends forward in a substantially hook shape. A support guide 8 for supporting the lower surface of the plate material W is arranged in the middle portion of the jaw 6, and a fixed die 7 is fixed to the front end portion of the jaw 6. The fixed die 7 is positioned so as to face the punch 10, and when the punch 10 is advanced, the fixed die 7 cooperates with the punch 10 to insert a plate material inserted between the punch 10 and the fixed die 7. W (shown by an imaginary line) is perforated.

Next, the operation of the puncher 1 will be described. The puncher 1 is started by pulling the trigger switch 21 of the portable handle 2 with a finger. The electric motor 3 is operated and the output shaft 30 and the cam shaft 31 are rotated. The needle bearing 32 located on the outer periphery of the cam shaft 31 rolls to reciprocate the pump piston 41 which is in sliding contact with the outer periphery of the needle bearing 32. Thus, the pump unit 4 feeds the hydraulic oil of a predetermined pressure to the hydraulic chamber 52 of the hydraulic cylinder device 5.

As the pressure in the hydraulic chamber 52 is increased, the piston 51 is moved forward (to the left in FIG. 1) while resisting the elastic force of the return spring 57. As a result, the piston rod 58 and the punch 10 are moved forward, and the punch 10 cooperates with the fixed die 7 to punch the plate W. When the piston 51 is advanced a predetermined distance, the release valve device 55 is opened and the hydraulic chamber 52 communicates with the release oil passage 54. The hydraulic oil in the hydraulic chamber 52 flows back to the oil tank 42 through the release oil passage 54, and the piston 51 is retracted to the initial position shown in FIG. 1 by the return spring 57, whereby the release valve device 55 is closed.

Since the basic structure and operating mode of such a puncher are disclosed in detail in the above-mentioned Japanese Patent Laid-Open No. 189022/1993, further detailed description will be omitted by citing this publication. 2A to 2C are a plan view, a side view and a front view showing the shape of the punch 10 according to the first embodiment of the present invention, respectively.

The punch 10 includes a cylindrical base portion 11 inserted into the front end portion of the piston rod 53, and a tip portion 12 having a substantially oval cross section. The base portion 11 is formed with a recess 13 that engages with the fixed bolt 19. In addition, the tip portion 12 has a height and width smaller than that of the base portion 11, and as shown in FIG. A front end face 15 extending inward in the direction and inclined with respect to the axis of the punch 10 and a front end face 16 orthogonal to the axis of the punch 10 are provided.

As shown in FIG. 2C, the cutting edge 14 has an oblong front shape and extends in the vertical direction. Further, the front end face 16 having a relatively narrow width extends from the upper end to the lower end of the cutting edge 14. A V-shaped groove 17 extending over the entire width of the foremost end face 16 is formed in the axial center portion of the foremost end face 16, and the groove 17 can be seen from the side of the punch 10 as shown in FIG. 2B. ..

According to the punch 10, by aligning the marking line K (FIG. 1) marked on the plate material W with the groove 17, the punch 10 and the plate material W can be aligned with each other. Therefore, the punch 10 does not need a guide pin protruding from the front end face 16. 3A to 3C are respectively a plan view, a side view and a front view showing a modified shape of the punch according to the first embodiment. The punch 10 shown in FIG. 3 has substantially the same structure as the punch shown in FIG. 2 except that the tip 12 has a circular cross section and the cutting blade 14 has a circular front shape. Is.

4A to 4C are a plan view, a side view and a front view showing the shape of the punch 10 according to the second embodiment of the present invention, respectively. 4, parts that are substantially the same as the parts shown in FIG. 2 are given the same reference numerals. In the punch 10 of this example, the tip portion 12 has a cutting edge 14 formed by a peripheral edge that is perpendicular to the outer peripheral surface. A front end face 15 extends in a radial direction from the cutting edge 14, and the front end face 15 forms a plane orthogonal to the axis of the punch 10. The front end surface 15 is provided at its central region with a protrusion projecting forward. The protrusion has an inclined surface 18 that forms an obtuse angle with the front end surface 15 and a frontmost end surface 16 that forms an obtuse angle with the inclined surface 18. Is equipped with. The frontmost end surface 16 extends over the entire width of the tip portion 12. The V-shaped groove 17 is formed in the shaft core portion of the front end face 16. According to the punch 10, the V-shaped groove 17 can be used to align the punch 10 with the plate W, as in the above-described embodiment.

The front end portion of the punch 10 has a cutting edge 14 that is perpendicular to the outer peripheral surface of the tip portion 12, and the cutting edge 14 has sharpness and durability against breakage. In addition, a step is attached to the front end of the punch 10, and the punch 10 is pressed stepwise against the plate material W. Therefore, the power load is distributed and the maximum power load is reduced.

The applicant of the present invention manufactured the punch 10 with a steel material SS400, attached the punch to the puncher 1 described above, and measured the actual current value during the punching process. As a comparative example, the punch having the conventional shape shown in FIG. 8 was attached to the puncher 1 and the actual current value during punching was measured. The punch has a diameter of 11 mm, and the plate material W used in the punching test has a plate thickness of 6 mm. The puncher 1 equipped with the conventional punch has a maximum current value of 11 A, while the puncher 1 equipped with the punch 10 of the second embodiment has a maximum current value of 9 A. The test results show that the punch 10 of this embodiment is extremely effective in reducing the load current value.

Further, in the drilling process, a plurality of holes may be formed in the same region with a slight shift. When performing such overlapping, a new hole is drilled around a position slightly offset from the core of the previously drilled hole. At this time, since the front end face of the punch partially collides with the edge of the existing hole, a so-called twisting force may be generated in the punch. For example, in the punch shown in FIG. 8, the inclined surface of the front end hits the edge of the existing hole and a relatively large prying force acts on the punch. However, in the punch 10 of the present example, the inclined surface 18 hits the edge of the existing hole at a relatively acute angle, or the cutting edge 14 hits this edge, so that the punching force is hard to act on the punch 10. That is, the punch 10 has a shape in which the prying force is hard to act when the holes are overlaid.

5A to 5C are a plan view, a side view, and a front view, respectively, showing a modified shape of the punch according to the second embodiment. The punch 10 shown in FIG. 5 has substantially the same structure as the punch shown in FIG. 4 except that the tip 12 has a circular cross section and the cutting blade 14 has a circular front shape. Is. The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above embodiments, and various modifications or changes can be made within the scope of the invention described in the scope of claims for utility model registration. Needless to say, these are also included in the scope of the present invention.

For example, the inclined wall 18 in the second embodiment may be formed as an upright wall extending at a right angle from the front end face 15. Further, in the second embodiment, the angle formed by the outer peripheral surface of the tip portion 12 and the front end surface 15 may be set to an acute angle.

[0032]

[Effect of the device]

 According to the configuration of the present invention as set forth in claim 1, the puncher is provided with a shape that reduces the power load on the puncher, secures the sharpness of the cutting edge, and is resistant to the so-called prying force when the holes are drilled. It is possible to provide a punch for use. According to the configuration of the present invention as set forth in claim 2, it is possible to provide a punch punch for which the distance between the punch and the die due to the protrusion of the guide pin can be avoided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hydraulically-operated puncher including a punch according to an embodiment of the present invention.

FIG. 2 is a plan view, a side view and a front view showing a shape of a punch according to a first embodiment of the present invention.

FIG. 3 is a plan view, a side view, and a front view showing a deformed shape of the punch according to the first embodiment.

FIG. 4 is a plan view, a side view and a front view showing the shape of a punch according to a second embodiment of the present invention.

5A and 5B are a plan view, a side view, and a front view showing a modified shape of a punch according to a second embodiment.

FIG. 6 is a vertical sectional view illustrating the most general sectional shape of a conventional punch.

FIG. 7 is a vertical cross-sectional view illustrating the cross-sectional shape of a conventional punch.

FIG. 8 is a vertical cross-sectional view illustrating the cross-sectional shape of another conventional punch.

[Explanation of symbols]

 10 Punch 11 Base 12 Tip 13 Cavity 14 Cutting Edge 15 Front End (First Front End) 16 Front End (Second Front End) 17 V-Shaped Groove 18 Slope

Claims (3)

[Scope of utility model registration request] 1. A cutting edge (14) formed on an outer periphery of a front end surface of a punch (10) and forming a right angle or an acute angle with respect to an outer peripheral surface of the punch, and a first extending from the cutting edge inward in a radial direction of the punch. A front end face (15) and a protrusion projecting forward from the first front end face are provided, the protrusion defining an inner edge of the first front end face, and a predetermined portion with respect to the first front end face. Defining a side wall (18) extending forward at an angle and a front edge of the side wall,
A second front end face (1
6) A punch punch for punchers, which is provided with. 2. The punch for puncher according to claim 1, wherein a groove (17) extending from an axis of the punch to an edge of the second front end surface is formed in the second front end surface. 3. A cutting blade (1) which is formed on the outer periphery of the front end surface of the punch (10) and forms a predetermined angle with the outer peripheral surface of the punch.
4), a first front end face (15) extending inward in the punch from the cutting edge, and a second front end face (16) arranged in front of the first front end face. On the front end face, a groove (17) extending from the punch axis to the edge of the second front end face.
A punch punch for punchers.